I think too many bold movements before any exclusivity is a bad thing to do..
Meeting up once a week doesnt really sounds like anything was too serious to me, then for you to give her flowers and a note probably scared her off a tad. Yeah, its a really nice thing to do, but there is a right time for everything and that wasnt the right timing. A guy once took me out for coffee and we had hung out at parties etc.. I didnt really think too much of us, maybe i liked him a little and could see us maybe taking things slow and going on a date or something.. But then he went to my house and left flowers and a note with my mother to give to me, text me all the time. Man, it scared the crap out of me and i just felt weird about it all. Also, giving me flowers and cards made me feel like he expected me to do something after that, like it would take us to the next level or something.. It was just too much.
Dont make the same mistake.
Its annoying when you dont know whats going on, but you SHOULD know whats going on you just dont want to believe it. If she hasnt contacted you in 5 days at all, then she just isnt too bothered about speaking to you, your feelings are obviously not mutual and you need to back right off.
Just concentrate on yourself, you had a life before you met her right? Get back to it and stop obsessing over her. It will do you NO good.
You have all the weapons you need... Now fight!